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To: voop who wrote (5306)	8/24/1999 6:45:00 PM
From: Percival 917	Read Replies (1) \| Respond to of 54805

Voop, The rings are a new procedure and as such I am not as familiar with it as I would like to be. I have continuing education coming up in Oct. and I hope to see cases presented. As far as Lasik goes the flap that is created is only a few microns thick. You have had scrapes that went much deeper. The microkeratome that is used is a circular device that fits around the periphery of the cornea and has a suction device as part of it. It gently raises the cornea so that the blade makes a superthin cut leaving a "hinge" piece attached, hense a flap. The middle layer of the cornea (the stroma) is then lasered in pulses to the degree needed. You as the patient are only aware of a rapid clicking noise from the laser. I would recommend you consider any of these procedures only if you have a SIGNIFICANT amount of astigmatism. If you have better than 20/80 vision uncorrected, I would not even think about it.